Some Democrats said they don’t have to wait for President Trump to pick a Supreme Court nominee — they’re voting “No” regardless of who he names.

Sen. Bob Casey became the latest one, saying Monday that the entire process the president has followed was “corrupt” because he was working from a list he wrote with the help of the conservative Heritage Foundation and Federalist Society.

Mr. Casey, Pennsylvania Democrat, said both of those groups have ties to corporations and he rejected anything that had their input.

“Any judge on this list is fruit of a corrupt process straight from the D.C. swamp,” he said.

Other Democrats, still salty over the GOP’s treatment of one of President Obama’s nominees in 2016, said they won’t accept any nominee until after the November election.

“If we are still operating under the McConnell Standard, and because we are even closer to an election now than we were in the Garland case, the Senate should wait until after the outcome of the November election before considering any nominee,” he said.

Mr. McConnell mocked Democrats’ objections, saying they’re rehashing the same arguments they made about past nominees — some of whom turned out to be rather liberal when they got on the high court.

He said Democrats’ rhetoric was also getting out of hand, pointing in particular to Sen. Kamala Harris, a California Democrat who predicted a Trump court nominee would mean “a destruction of the Constitution of the United States.”

“It’s hard to keep a straight face when you hear stuff like that,” Mr. McConnell said Monday on the chamber floor. “The far-left rhetoric comes out every single time. But the apocalypse never comes.”

Democrats are hopeful they can retake the Senate in November and force Mr. Trump to name a pick more to their liking.

“I’ll fight to make sure there are no hearings to replace Justice Kennedy until after the election. This is our democracy. Let’s fight like it,” Sen. Kirsten Gilibrand tweeted.